Curiouser and curiouser.

I hauled out the high magnification and took a really good look at those two which is something that I had not thought to do before. I agree that it really does appear that someone, somewhere, has created a little handstamp, posibly two since the second part of the word does not align with the first all that well, and has treated some previously used stamp. It really does look as if the overprint runs across the cancel though that, under high magnification, is still a little uncertain.
As I said, these two were found in a small general worldwide collection, probably compiled in the late 1940's, early 1950's and it was of North American origin. So whatever was done happened more than fifty years ago.
Why would someone bother? Yes the catalogue value is somewhat higher (I checked) for the early issues but retail on individual stamps would currently be only a few dollars at best in Canada or the U.S. and would have been much less at the apparent time of manufacture. Something this crude is not something I would pay even a few dollars for if I knew nothing about it (which I don't).
If nothing else, it makes an interesting aside to my collection and I am still wondering if anyone can come up with any more information on the series or the reason behind the forgeries.
Thanks for the suggestions.